TB Skin Test

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Also known as: PPD (Purified Protein Derivative); Mantoux (previously Heaf test); Latent Tuberculosis Infection test (LTI)
Formal name: Tuberculin Skin Test
Related tests: AFB Culture

At a Glance

Why Get Tested?

To help determine whether or not you may have been exposed to and become infected by the Mycobacterium tuberculosis (TB) bacteria

When to Get Tested?

  • When you have diseases or conditions that weaken your immune system and put you at a greater risk of developing active tuberculosis.
  • When you have had close contact with someone who has active TB, or work or live in a high risk environment.
  • When you have lived for a period of time in a foreign country where TB may be more common.
  • Sometimes as part of an examination prior to starting a new job (such as a healthcare worker).

Sample Required?

No sample is required. A small amount of purified protein derivative (PPD) solution is injected just under the first layer of skin of your inner forearm.

Test Preparation Needed?